In my opinion, 8 x 6 is a little small, but could work.. I wear a
tux often enough, and have made many sets for other customers. The
most important part of the stud is that it covers the button hole.
They are also inserted either from the front, using a T-shaped bar,
or from the back, with a smaller button and a larger back plate. You
can purchase the T-bar parts from a findings supplier. Personally, I
prefer to have a smaller button with a large back and insert them
into the hole from the inside of the shirt. Unless you have a valet,
or someone to assist you in dressing, these are easier to wear.
If you find that you might like making cuff links and studs, check
out this wonderful book: "Cuff Links," by Susan Jonas and Marilyn
Nissenson, published by Harry N. Abrams, 1991.
35 N. Market St.
Frederick, MD 21701